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TRACTION ENGINE. APPLICATION man LAY 25. 191a.

' INVENTOR fizz/5am Z/Wfiilli Patented May 20, 1919.

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M| ullil .IIIIIIILIII W. TURNBULL.

TRACTION ENGINE. 7

APPLICATION man MAY 25. 1912.

1,304,416; Patented May 20, 1919 4 SHEETS-SHEET 2.

WITNESSES: IN VENTOR A'rrunsuvu W. TURNBULL. TRACTION ENGINE. APPLICATION FILED MAY 25. I918 Patented May 20, 1919.

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Patented May 20; 1919.

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INVENTOR, Mm 7522 225225 zz BY ATTORNEYS UNITED STATES PATENT OFFICE.

WILLIAM, TUmULL, orrnonm, ILLINOIS, ASSIGNOR TO THE HOLT MANUFACTURING COMPANY, OF STOCKTON, CALIFORNIA, A CORPORATION OrcALIFonNIA.

TRACTION-ENGINE.

Specification of Letters Patent.

- Patented May 20, 1919.

Application filed May 25, 1918. Serial NO. 236,521.

To all whom it may concern Be it known that I,'WILLIAM TURNBULL, a citizen-of the United States, residing at Peoria, in the county of Peoria and State of Illinois, have invented new and useful Improvements in Traction-Engines, of which the following is a specification.

This invention relates to tractors of the type shown and described in my application, Ser. No. 77,382, filed February 10th, 1916, and hasfor its object to simplifyand improve the manufacture and assembly of the machine, and particularly to render the transmission mechanism readily accessible.

In this earlier application I have shown and described a one-piece cast metal frame which is adapted to'support the entire transmission mechanism. Although the transmission case cover in that case is removable, itis very difficult to get Out the transmission to effect any ad ustments or repairs and often requires dismantling of a considerable part of the traction engine to get down into the bed where the various gears and shafts are located.

In the present instance I so build the frame and transmission case cover and rearrange the transmission that the transmission mechanism is supported upon and carried by the transmission-case cover and is removable as a unit therewith. The advan tages of such a construction'are obvious. In carrying out the invention the lower portion of the transmission housing forms part of the main frame, being either cast integrally therewith or otherwise built into it frames are designed for heavy duty work inas an indispensable part thereof. Such a construction afi'ords great convenience in manufacture and assembling and provides a rigid structure, eliminating to a great extent the use of bolts and riveting means with the resulting possibility of loose joints.

These one-piece cast or structural metal traction engine construction employing endless, self-laying tracks of the chain track principle. It has not been thought necessary to illustrate these chain tracks because their operation is well understood, and the method of use of these metal frames in tractionengine construction is illustrated in my earlier applicationabove mentioned.

One form which myinvention may assume is exemplified in the following de- 2 scription and illustrated in the accompanying drawings, in which Figure 1 shows a plan view of a one-piece main frame construction formed integrally with which is the lower portion of the transmission housing.

Fig. 2 shows a side elevation of the same.

Fig. 3 shows a front end elevation.

Fig. 4 shows a vertical, central, longitudinal, sectional view of the transmission mechanism arranged within the housing and supported entirely upon the detachable cover of said housing.

Fig. 5 shows a plan view of therear end of the frame, parts of the driving mechanism being shown in cross-section.

Fig. 6 is an exterior side elevation of Fi 4.

is shown in the drawings, the main frame comprises parallel side bars 10, a front end piece 11, forward cross sills 12 and rearward cross sills 13, and the lower half 11 of the transmission housing, all cast in one piece.

An axle 15 carrying at each 'end a sprocket driving wheel 16 is journaled upon the lower portion of the transmission housing at the exterior thereof in bearings 15, and forwardly of the axle is a divided drive shaft '18 extending through either side of the lower portion of the housing, there being on the outer end of each portion of shaft 18, exterior of the housing, a pinion 19 meshing with a spur gear 20 fixed upon the hub of the adjacent sprocket driving wheel. 1

The inner end of each portion of shaft 18.

carries a spur gear 22 receiving power from change speed transmission mechanism presently to be described, and which transmission mechanism is carried entirely upon the cover or detachable upper portion-14 of the transmission housing.

This transmlssion mechanism includes an 28, the upper portion of which ring is formed integrally with the cover and the lower half of which is formed on an arm 29 bolted to said cover. The shaft 26 has a high speed driven gear 30 and a low speed driven gear 31 splined thereon and slidable in unison by shift mechanism of any suitable form, not shown. The gear 25 is constantl in mesh with a gear 32 on a countershatt 33, which countershaft, as shown in Fig. 4, is arranged below the main shaft and journaled at opposite ends in roller bearings, the bearings at the forward end being carried in a ring 34 formed integrally with the tubular extension 24 and at the rear endin a ring 35 formed upon the arm 29.

Fixed upon the countershaft is a high speed driving gear 36 adapted to be engaged by the gear 30 and a low speed driving gear 37 adapted to be engaged by the gear 31, also a reverse gear 38 meshing with an idler gear 39 on a separate support 40 carricd by the cover. The idlergear 39 is'in turn engaged by the gear 31.

The above described change speed gear set is in principle substantially like that shown and described in my prior application before referred to, and is to be considered merely as one form of a variety of arrangements which may be employed in carrying out my invention.

The rear end of the main shaft 26 carries a bevel pinion 41 which meshes with a bevel gear 42 on a transverse drive shaft 43. This transverse shaft carries right and left sprocket driving sleeves 44, each arranged to be connected to the shaft 43 by means of an individual friction clutch mechanism 45 of the multiple disk type, controllable in the manner shown and described in mv prior application above referred to, whereiby to steer the vehicle. The shaft 43 and sleeves 44 are j ournaled in a divided bearing 46, the upper portion of which is integral with the cover and the lower portion of which is formed integral with the arm 29. Each sleeve 44 has a pinion 47 tomesh with the adjacent spur gear 22 before referred to.

The operation'of the above described transmission mechanism is the same as that shown and described in my prior application before referred to. v 7

At the top portion of the cover 14 in a plane with the main shaft 26 is a power shaft 48 for supplying power for exterior purposes, as, for instance, driving a belt pulley; This power shaft is above the countershaft as well as the main shaft and receives its turning movement through a pinion 56 meshing with the constantly rotating pinion 25. The forward end of the power shaft is journaled in roller bearings supported by a ring 57 formed on the forward end of the cover of the transmission housing, andi-the rear end of the power shaft mechanism, including the change speed gear set and the power shaft for the belt pulley,

are carried entirely by the cover of the transmission casing. This cover is fitted detachably upon the lower portion of the casing and is bolted tightly thereon so that the casing is entirely inclosed in the usual manner. When it is desired to remove the transmission mechanism the cover is taken off bringing with it the gear set and associated parts without disturbing the lower portion of the casing, which forms an indispensable part of the main frame.

Aside from the advantage of accessibility of the parts of the transmission mechanism, this manner of mounting the gears on the cover provides a still greater advantage in that the lower half of the transmission housing does not have to'be machined to the extent that would be necessary if the bearings for the various shafts of the transmission mechanism were formed thereon, since the lower portion of the housing forms a part of the main frame and is therefore quite heavy and cumbersome and it Will be ings thereon is diiiicult. Also with the transmission parts so arranged upon a small nnitary frame, such as the cover 14*, it becomes much easier to assemble the machine.

Having thus described my invention, what I claim and desire to secure by Letters Patent is 1. In a self-propelled vehicle, a main frame, a transmission mechanism carried 5 thereby, a housing for the transmission mechanism, the lower portion of which forms an integral part of the main frame, a detachable cover for said housing, and a change speed gear set forming'part of the transmission mechanism within said housing carillied by the cover and removable therewit 2. In a self-propelled vehicle, a main frame, a transmission mechanism carried thereby, a. housing for the transmission mechanism, the lower portion of which forms an integral part of the main frame, a detachable cover for said housing, a change speed gear set forming part of the .transinission mechanism carried within said housing and supported upon the cover, a power shaft carried also upon said cover within the easing, and means for operatively connecting said power shaft with the transmission mechanism.

3.- In a self-propelled vehicle, a main frame forming a part of a base portion of a gear housing, sprocket driving wheels journaled in the lower portion ofthe housing, a

detachable cover for the housing, and a 4. In a self-propelled vehicle, a main frame forming a part of a base portion of a gear housing, a pair of sprocket driving wheels journaled independently of each other, one on each side of the gear housing, a detachable cover for the housing, a transmission mechanism, including a set of change speed gears carried within the housing upon said cover, and removable therewith, and individual friction clutch members exterior of aiid carried by the. cover for driving each sprocket.

5. In a self-propelled vehicle, a main frame forming a part of the lower portion of a gear housing, final driving gears for rear wheels on the vehicle journaled in the lower portion of said housing, a detachable cover for the casing, and a transmission mechanism carried on said cover for trans: mitting power from said transmission to drive the driving gears.

6. In a self-propelled vehicle, the combination of a one-piece cast metal frame having formed integrally therewith the lower part of a transmission housing, and a detachable cover for said transmission housing withv a variable speed gear transmission mechanism carried on the cover, and removable therewith as a unit. 1

7 In a self-propelled vehicle, a transmission mechanism carried thereby, a housing for the transmission mechanism, a cover for said housing, a variable speed gear transmission mechanism carried by the cover, and removable with the same, a pair of driving members journaled in the housing, and means for transmitting power from the variable speed gear transmission to either of said driving members or to both in unison.

8. In a self-propelled vehicle, a main frame, a transmission mechanism carried thereby, a housing for the transmission mechanism, a detachable cover for said housing, a variable speed gear transmission carried by the cover and removable with the same, a drive shaft also carried by thecover and removable therewith, means for transmitting power from the variable speed gear transmission to the drive shaft, a pair of driving members journaled in the housing, and means for transmitting power from the i drive shaft to either driving member or both in unison.

9. In a self-propelled vehicle, a main frame, a transmission mechanism carried thereby, a housing for the transmission mechanism, a detachable cover for said housing, a variable speed gear transmission carried by the cover and removable with the same, a drive shaft also carried by the cover and removable therewith, means for transmitting power from the-variable speedgear transmission to the drive shaft, a pair of driving members journaled in the housing, a

pair of clutch members carried by the drive shaft, and means for transmitting power through said clutches to drive either driving member or both in unison, said clutches being removable with the cover.

10. In a self-propelled vehicle, a 'main frame, a transmission mechanism carried thereby, a housing for the transmission mechanism, the lower 'portion of which forms an integral part of the main frame, a

detachable cover for said housing, a variable speed gear transmission journaled in and carried by the cover, a pair of driving members journaled in the transmission housing, and'means for transmitting power from the variable speed gear transmission to drive either driving member'or both in unison either reverse or ahead.

11. In a self-propelled vehicle, a main frame, a transmission mechanism carried thereby, a housing for the transmission mechanism, the lower portion of which forms an integral part of: the main frame, a detachable cover for said housing, a variable speed gear transmission journaled in and carried by the cover, a drive shaft carried by the cover and removable with the.

same, a pair of driving members journaled one on each side of the housing, means for transmitting power from the variable speed gear transmission to drive the drive shaft either reverse or ahead, and means for transmitting power from the drive shaft to drive either driving member or both in unison.

12. In a self-propelled, vehicle, a main frame, a transmission mechanism carried thereby, a housing for the transmission mechanism, the lower portion of which forms an integral part of the main frame, a detachable cover for said housing, a variable speed gear transmission journaled in and carried by the cover, a drive shaft carried by the cover and removable with the same, a pair of driving members journaled one on each side of the housing, means for transmitting power from the variable speed gear transmission to drive the drive shaft either reverse or-ahead, a divided shaft journaled in the transmission housing, means for transmitting power-from the drive shaft to drive either section of the divided shaft a naoaaae ried by the cover and removable with the same, a pair of driving members journaled one on each side of the housing, means for transmitting power from the variable speed gear transmission to drive the drive shaft either reverse or ahead, a divided shaft journaled in the transmission housing, a pair. of

friction clutches carried by the drive shaft, means for transmitting power through each friction clutchto drive each section of the divided shaft, and means for transmitting power from each section of the divided shaft to drive the driving members. I

1a. In a self-propelled Vehicle, a main frame, a transmission mechanism carried thereby, a housing for the transmission mechanism, the lower portion of which forms an integral part of the main frame, a detachable cover for said housing, a variable speed gear transmission mechanism carried by and removable with the cover, a

pair of driving members journaled inthe' transmission housing, a drive shaft carried by the cover and removable therewith, said drive shaft extending through each side of the cover, means for transmitting power from the variable speed gear transmission to drive the drive shaft, a friction driving member on each endof the driving shaft exterior of the cover, and means for transmittingpower through each friction driving member to each driving member.

15. In a self-propelled vehicle, a main frame, a transmission mechanism carried thereby, a housing for the transmission mechanism, the lower portion of which forms an integral part of the main frame, a detachable cover for said housing, a variable speed gear transmission mechanism carried by and removable with the cover, a pair of driving members journaled in the transmission housing, a drive shaft carried by the cover and removable therewith, said drive shaft extending through each side of the cover, means for transmitting power from the variable speed gear transmission to drive the drive shaft, a friction clutch on each end of the drive shaft exterior of the cover. a divided shaft journaled in the transmission housing, means for transmitting power through the friction clutches to drive each'section of the divided shaft either independently or in unison, a pair of driving sprockets journaled one on each side of the transmission housing, and means for transmitting power from each section of the divided shaft to drive each adjacent driving sprocket.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

EMIL F. NoRELIUs, H. B. BAKER. 

